Room retention event implementation

Podfile.lock

@@ -39,17 +39,17 @@ PODS:
   - LoggerAPI (1.9.200):
     - Logging (~> 1.1)
   - Logging (1.4.0)
-  - MatrixSDK (0.27.8):
-    - MatrixSDK/Core (= 0.27.8)
-  - MatrixSDK/Core (0.27.8):
+  - MatrixSDK (0.27.9):
+    - MatrixSDK/Core (= 0.27.9)
+  - MatrixSDK/Core (0.27.9):
     - AFNetworking (~> 4.0.0)
     - GZIP (~> 1.3.0)
     - libbase58 (~> 0.1.4)
     - MatrixSDKCrypto (= 0.4.2)
     - OLMKit (~> 3.2.5)
     - Realm (= 10.27.0)
     - SwiftyBeaver (= 1.9.5)
-  - MatrixSDK/JingleCallStack (0.27.8):
+  - MatrixSDK/JingleCallStack (0.27.9):
     - JitsiMeetSDKLite (= 8.1.2-lite)
     - MatrixSDK/Core
   - MatrixSDKCrypto (0.4.2)
@@ -187,7 +187,7 @@ SPEC CHECKSUMS:
   libPhoneNumber-iOS: 0a32a9525cf8744fe02c5206eb30d571e38f7d75
   LoggerAPI: ad9c4a6f1e32f518fdb43a1347ac14d765ab5e3d
   Logging: beeb016c9c80cf77042d62e83495816847ef108b
-  MatrixSDK: 4c5a8572a481340ab233451ad36c1322d371fae5
+  MatrixSDK: 246fd1d3620afcbf8cb76794e9343ebf3cbf881b
   MatrixSDKCrypto: 736069ee0a5ec12852ab3498bf2242acecc443fc
   OLMKit: da115f16582e47626616874e20f7bb92222c7a51
   ReadMoreTextView: 19147adf93abce6d7271e14031a00303fe28720d
@@ -209,4 +209,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: b622ffadc1a0fe5442787bd9023ca3d110384814
 
-COCOAPODS: 1.15.2
+COCOAPODS: 1.14.3

Riot/Categories/MXRoomSummary.swift

@@ -0,0 +1,58 @@
+//
+// Copyright 2024 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+extension Notification.Name {
+    static let roomSummaryDidRemoveExpiredDataFromStore = Notification.Name(MXRoomSummary.roomSummaryDidRemoveExpiredDataFromStore)
+}
+
+extension MXRoomSummary {
+    @objc static let roomSummaryDidRemoveExpiredDataFromStore = "roomSummaryDidRemoveExpiredDataFromStore"
+    @objc static let roomRetentionStateEventType = "m.room.retention"
+
+    private enum Constants {
+        static let roomRetentionInDaysKey = "roomRetentionInDays"
+    }
+    /// Get the room messages retention period in days
+    func roomRetentionPeriodInDays() -> uint {
+        if let period = self.others[Constants.roomRetentionInDaysKey] as? uint {
+            return period
+        } else {
+            return 365
+        }
+    }
+
+    /// Get the timestamp below which the received messages must be removed from the store, and the display
+    @objc func minimumTimestamp() -> UInt64 {
+        let periodInMs = Tools.durationInMs(fromDays: self.roomRetentionPeriodInDays())
+        let currentTs = (UInt64)(Date().timeIntervalSince1970 * 1000)
+        return (currentTs - periodInMs)
+    }
+
+    /// Remove the expired messages from the store.
+    /// If some data are removed, this operation posts the notification: roomSummaryDidRemoveExpiredDataFromStore.
+    /// This operation does not commit the potential change. We let the caller trigger the commit when this is the more suitable.
+    ///
+    /// Provide a boolean telling whether some data have been removed.
+    @objc func removeExpiredRoomContentsFromStore() -> Bool {
+        let ret = self.mxSession.store.removeAllMessagesSent(before: self.minimumTimestamp(), inRoom: roomId)
+        if ret {
+            NotificationCenter.default.post(name: .roomSummaryDidRemoveExpiredDataFromStore, object: self)
+        }
+        return ret
+    }
+}

Riot/Categories/MXSession.swift

@@ -25,4 +25,16 @@ extension MXSession {
                            matrixItemId: userId,
                            displayName: user?.displayname)
     }
+
+    /// Clean the storage of a session by removing the expired contents.
+    @objc func removeExpiredMessages() {
+        var hasStoreChanged = false
+        for room in self.rooms {
+            hasStoreChanged = hasStoreChanged || room.summary.removeExpiredRoomContentsFromStore()
+        }
+
+        if hasStoreChanged {
+            self.store.commit?()
+        }
+    }
 }

Riot/Modules/Application/LegacyAppDelegate.m

@@ -1826,6 +1826,9 @@ - (void)initMatrixSessions
             [self registerNewRequestNotificationForSession:mxSession];
 
             [self.pushNotificationService checkPushKitPushersInSession:mxSession];
+
+            // Clean the storage by removing expired data
+            [mxSession removeExpiredMessages];
         }
         else if (mxSession.state == MXSessionStateRunning)
         {

Riot/Modules/Room/DataSources/RoomDataSource.m

@@ -33,6 +33,9 @@ @interface RoomDataSource() <RoomReactionsViewModelDelegate, URLPreviewViewDeleg
 {
     // Observe kThemeServiceDidChangeThemeNotification to handle user interface theme change.
     id kThemeServiceDidChangeThemeNotificationObserver;
+
+    // The listener to the room retention changes.
+    id retentionListener;
 }
 
 // Observe key verification request changes
@@ -167,6 +170,31 @@ - (void)updateEventFormatter
     self.eventFormatter.eventTypesFilterForMessages = [MXKAppSettings standardAppSettings].eventsFilterForMessages;
 }
 
+- (void)setDelegate:(id<MXKDataSourceDelegate>)delegate
+{
+    [self unregisterRoomSummaryDidRemoveExpiredDataFromStoreNotifications];
+    [self removeRoomRetentionEventListener];
+
+    if (delegate && self.isLive)
+    {
+        if (self.room)
+        {
+            // Remove the potential expired messages from the store
+            if ([self.room.summary removeExpiredRoomContentsFromStore])
+            {
+                [self.mxSession.store commit];
+            }
+            [self addRoomRetentionEventListener];
+        }
+
+        // Observe room history flush (expired content data)
+        [self registerRoomSummaryDidRemoveExpiredDataFromStoreNotifications];
+        [self roomSummaryDidRemoveExpiredDataFromStore];
+    }
+
+    [super setDelegate:delegate];
+}
+
 - (void)destroy
 {
     if (kThemeServiceDidChangeThemeNotificationObserver)
@@ -197,6 +225,9 @@ - (void)destroy
         [self.mxSession.aggregations.beaconAggregations removeListener:self.beaconInfoSummaryDeletionListener];
     }
 
+    [self unregisterRoomSummaryDidRemoveExpiredDataFromStoreNotifications];
+    [self removeRoomRetentionEventListener];
+
     [super destroy];
 }
 
@@ -1242,4 +1273,79 @@ - (void)updateCurrentUserLocationSharingStatus
     }
 }
 
+#pragma mark - roomSummaryDidRemoveExpiredDataFromStore notifications
+
+- (void)registerRoomSummaryDidRemoveExpiredDataFromStoreNotifications
+{
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(roomSummaryDidRemoveExpiredDataFromStore:) name:MXRoomSummary.roomSummaryDidRemoveExpiredDataFromStore object:nil];
+}
+
+- (void)unregisterRoomSummaryDidRemoveExpiredDataFromStoreNotifications
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:MXRoomSummary.roomSummaryDidRemoveExpiredDataFromStore object:nil];
+}
+
+- (void)roomSummaryDidRemoveExpiredDataFromStore:(NSNotification*)notification
+{
+    MXRoomSummary *roomSummary = notification.object;
+    if (self.mxSession == roomSummary.mxSession && [self.roomId isEqualToString:roomSummary.roomId])
+    {
+        [self roomSummaryDidRemoveExpiredDataFromStore];
+    }
+}
+
+- (void)roomSummaryDidRemoveExpiredDataFromStore
+{
+    // Check whether the first cell data refers to an expired event (this may be a state event
+    MXEvent *firstMessageEvent;
+    for (id<MXKRoomBubbleCellDataStoring> cellData in bubbles)
+    {
+        for (MXEvent *event in cellData.events)
+        {
+            if (!event.isState) {
+                firstMessageEvent = event;
+                break;
+            }
+        }
+
+        if (firstMessageEvent)
+        {
+            break;
+        }
+    }
+
+    if (firstMessageEvent && firstMessageEvent.originServerTs < self.room.summary.minimumTimestamp)
+    {
+        [self reload];
+    }
+}
+
+#pragma mark - room retention event listener
+
+- (void)addRoomRetentionEventListener
+{
+    // Register a listener to handle the room retention in live timelines
+    retentionListener = [self.timeline listenToEventsOfTypes:@[MXRoomSummary.roomRetentionStateEventType] onEvent:^(MXEvent *redactionEvent, MXTimelineDirection direction, MXRoomState *roomState) {
+
+        // Consider only live events
+        if (direction == MXTimelineDirectionForwards)
+        {
+            // Remove the potential expired messages from the store
+            if ([self.room.summary removeExpiredRoomContentsFromStore])
+            {
+                [self.mxSession.store commit];
+            }
+        }
+    }];
+}
+
+- (void)removeRoomRetentionEventListener
+{
+    if (retentionListener)
+    {
+        [self.timeline removeListener:retentionListener];
+        retentionListener = nil;
+    }
+}
+
 @end

Riot/Utils/Tools.h

@@ -48,4 +48,17 @@
  */
 + (NSURL*)fixURLWithSeveralHashKeys:(NSURL*)url;
 
+#pragma mark - Time utilities
+
+/**
+ * Convert a number of days to a duration in ms.
+ */
++ (uint64_t)durationInMsFromDays:(uint)days;
+
+/**
+ * Convert a duration in ms to a number of days.
+ */
++ (uint)numberOfDaysFromDurationInMs:(uint64_t)duration;
+
+
 @end

Riot/Utils/Tools.m

@@ -117,4 +117,16 @@ + (NSURL *)fixURLWithSeveralHashKeys:(NSURL *)url
     return fixedURL;
 }
 
+#pragma mark - Time utilities
+
++ (uint64_t)durationInMsFromDays:(uint)days
+{
+    return days * (uint64_t)(86400000);
+}
+
++ (uint)numberOfDaysFromDurationInMs:(uint64_t)duration
+{
+    return (uint)(duration / 86400000);
+}
+
 @end